镁热还原法制备有序介孔Si/C锂离子电池负极材料及其电化学性能

doi:10.3866/PKU.WHXB201605124

Abstract

Abstract:

A highly ordered mesoporous Si/C composite was prepared by magnesiothermic reduction method, using SBA-15 as the precursor at 660 ℃ with subsequent carbon coating. This Si/C composite preserved the ordered honeycomb pore channels of SBA-15 and exhibited a lotus root-like structure with high packing density. A liquid ambient reaction model is proposed to explain the reaction between SBA-15 and magnesium powder at 660 ℃ as well as the mechanism by which the highly ordered mesoporous structure is generated. The phase composition and morphology of this material were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption and Raman spectroscopy. The excellent electrochemical performance of the as-prepared material suggests potential applications as an anode material in second-generation Li-ion batteries.

Key words: Li-ion battery, Mesoporous silicon, Anode material, Nanocomposite, Magnesiothermic reduction method

MSC2000:

O646

Yan-Ping TANG,Sha YUAN,Yu-Zhong GUO,Rui-An HUANG,Jian-Hua WANG,Bin YANG,Yong-Nian DAI. Magnesiothermic Reduction Preparation and Electrochemical Properties of a Highly Ordered Mesoporous Si/C Anode Material for Lithium-Ion Batteries[J].Acta Phys. -Chim. Sin., 2016, 32(9): 2280-2286.

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Magnesiothermic Reduction Preparation and Electrochemical Properties of a Highly Ordered Mesoporous Si/C Anode Material for Lithium-Ion Batteries

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